So what about the robot ? I’m going to try to keep it simple for a first. So a two-wheeled wall avoiding robot should be fine. I have a sonic sensor at hand for the wall avoiding part, and candle-holding plastic thingies will do the trick as for the wheels (yeah it’s a low-budget kind of robot).
worked fine was a good way to start : the speed of the motors is proportional to the distance measured by the sensor.